Spray head



0d 1929. e. A. MUELLER ET'A'L I 1,732;69I"

' SPRAY mam) Filed A ril 28, 192'! B E35 20 m 5 1 Fig.1

A f l Patented Oct. 22, 1929 UNITED STATES PATENT OFFICE GODFREY A. MUELLER, OF POINT PLACE-AND ROBERT W. TRACY, O1 TOLEDO, OHIO,

ASBIGNORS OHIO Application alt- 1 April as,

The primary 0 ject of the invention is the provision of a simple and efiicient construction of spray-head of this character having supplemental spray flattening jets for the air or other motive fluid and having a novel control therefor.

The invention is fully described in the following specification, and one embodiment thereof "illustrated in the accompanymg drawings, in which,-

Figure 1 is a central longitudinal section of the spray-head unit of a spray gun removed from the gun and with the supply passages to the supplemental jets closed. Fig. 2 is a front end of the outer nozzle member which contains the supplemental air jets. Fig. 3 is a front end View of the spray-head proper with the outer nozzle and its retaining member removed. Fig. 4 is a slde elevation thereof with the supply passages to" the supplemental jets partiall open, and Fig. 5 is a rear endview thereo taken on the-section line 5-5 in Fig. 1.

' rear of and in surrounding Referring to the drawings, 1 designates the portion of a spray gun body to which the spray-head is attached and which, W1t-h the spray-head in the present instance, may be considered asa spray-head umt, inasmuch as it is detachable as a unit from the spraygun proper. The assembled connection with a spray-gun body of such a unit equipped with a diderent construction of a spray-head is illustrated in U. S. Letters Patent No. 1,613,588 dated Jan. 4, 1927.

The body member 1 has an' enlarged forward end portion 2 with a reduced forward extension 3 and an annular sho alder 4 at the relation to said extension. A reduced portion 5 extends rearwardly from the rear end of the enlargement 2 concentric therewith and has a lateral extension 6 forming a nipple for connection with a source of material supply. The enlargement 2 and extension 3 are formed w1th a central bore 7 having a reduced bore 8 extending rearwardly therefrom in centered re- TO THE DE VILBISS COMPANY, OF TOLEDO, OHIO, .A CORPORATION 01 SPRAY HEAD 1927. serial 110. 187,142.

lation thereto through a ortion of the stem 5 and thence laterally t rough the nipple portion6.

An inner or liquid discharge nozzle 9, in the present instance of substantiallycylindrical form, is provided intermediate its ends with an enlargement 10 having its rear end portion of cylindrical form and threaded to adapt it to thread into the bore 7 of the body member extension 3 with the rear end of the nozzle 9 seating against the bottom of the bore 7 marginally around the reduced bore 8. The seat thus provided is preferably of conical form, as shown at 11, and the forward end of the bore 8 registers with the rear end of a similar axially disposed bore 12 in the nozzle 9. The forward end of the nozzle 9 is reduced in size and terminates in a nipple 13 having an axial material discharge orifice therethrough in communication with the bore 12 of the nozzle and adapted to be closed by a valve12. The end portion of the nozzle 9 without the enlargement 10 is provided with flattened sides or, in the present instance, is made hexagonal in form to adapt it for receiving a wrench to facilitate turning the nozzle into or out of the body member.

The enlargement 10 of the nozzle 9 is provided at itsforward end with a further annular enlargement 1 1 which has its forward edge portion overhanging the forward end portion of the nozzle 9 and forming an internal conical seat 15. The outer side or circumferential portion of the enlargement 14 is made ofconical form with its small end at the rear.

A collar 16 surrounds the nozzle enlargement 14 and forward extension 3 of the body member, and has its forward end formed with an internal conical portion for rotatable seating on the conical surface of the enlargement 14 and its rear end adapted to abut against the body shoulder 4, preferably through an interposed spring washer 17, so that the conical portion of the collar is held yieldingly' body enlargement 2 and has its outer peripheral surface knurled or roughened to fac1l1- .tate a hand-turning of the same relative to the body.

The outer nozzle 19. of the spray-head is centrally cored out at its inner side to fit over the outer end of the nozzle 9 and to provide a space 20 therebetween. The front end of the nozzle 19 is provided with a centrally disposed restricted air discharge orlfice 21, which receives the tip 13 of the inner nozzle and cooperates therewith to form a thin annular discharge passage entirely around the tip 13 and in communication at its inner end with the air space 20.

The inner end of the nozzle 19 is formed marginally around the cored out portion of the nozzle with an annular flange 22 having a conical outer edge portion which seats within the overhanging forward end of the nozzle enlargement 14 and against the conical seat 15 thereof. The nozzle 19 is held firmly to said seat 15 with its discharge orifice 21 in true concentric relation to the discharge orifice of the tip 13 by a union nut 23, which is threaded at its rear end onto the outer side of the collar 16 and has its forward end rovided with an inturned flangein shouldered engagement with an outturned flange 24 on the outer edge of the inner end portion of said nozzle.

The air under pressure is supplied to the bore 7 in the enlargement 2 of the body member and around the inner end of the inner nozzle 9 through a passage 25 and is thence supplied to the space 20 between the inner and outer nozzles 9 and 19 through assages 26,

a plurality of which are provi ed through the enlargement 10 of the innernozzle. The supply of such air or motive fluid to the nozzle is controlled by a valve, not shown, usually carried by the spray-gun body.

It is common in this art to produce a flattened or fan-like spray of the stream of air and material discharging from the main orifices of the inner nozzles 9 and 19 by discharging supplemental jets of air against opthe union nut 23 between the adjacent ends of the collar 16 and nozzle member 19. The forwardly overhanging portion of the enlargement 14 of the inner nozzle 9 is provided with aplurality of passages 29 which are in communication at their inner ends with the air space 20 and have their outer ends opening through the conical surface of the enlargement 14 into the space 28. In order to held to said body member.

control the discharge of air from the supplemental passages 27 the collar 16 is provided at its forward edge with a flange 30 for each passage 29, such flange seating at its inner side on the taper of the enlargement 14 and adapted, when in one position with respect to the respective opening 29, to completely close the same. Each flange 30 is gradually shallowed inwardly toward the body of the collar 16 from one end to the other thereof, so that a turning of the flange with respect to an opening 29 will effect a gradual uncovering of the opening so that the quantity of discharge of air through the opening may be controlled by the extent of relative turning of the collar 16. In Fig. 4'the opening 29 is shown as partially uncovered. The broad end of the flange 30 terminates abruptly so that the opening 29 may be quickly uncovered when such end is turned from over the same. It is thus evident that the collar 16 serves as a valve member for controlling the discharge of air from the supplemental orifices 27 and that a regulation of the quantity and force of discharge of such air is effected by a turning of the collar relative to the body enlargement 2 and the inner nozzle 9, which is firmly In the use of devices of this character, it is necessary to frequently take the spray-heads thereof apart so as to clean the same, and, after re-assembling the parts, it is necessary for the operator to experiment for a short period in order to obtain the same discharging air pressure for the supplemental jets as he previously had. This is necessary in order to keep the work uniform. With the present construction of spray-head it is an exceedingly simple matter to re-asseinble the parts and obtain the same adjustment as previously had, it being merely necessary to provide a graduated scale on the rear end of the collar enlargement 18 or the adjacent surface of the body enlargement 2 and to provide a registering point or indicator mark on the other of said surfaces, as shown in Fig. 5 herein. The

rear end of the collar enlargement 18 is provided with a graduated scale 31, and the adj acent surface of the body enlargement 2 is provided with a cooperating indicator mark 32. This indicating mark being provided on the spray-head, it is merely necessary for the operator to note the position of the indicator mark 32 with respect to the scale before taking the spray-head apart, and upon re-assembling the parts to so position the collar 16 that the scale reading is the same. This places the flanges 30 of the collar 16' in the same position with respect to the openings 29 as before due to the fact that the enlargement 14 in which said openings are provided is substantially in fixed or set relation to the body mem- It will, of course, be understood that while the valve flanges 30, in the present instance,

' the valve member is turned, such anges may be of other form without departing from the spirit of the claims. It will also be understood that while we have described and shown a particular arrangement and construction of the parts, such arrangement and construction may be varied or changed Within the scope of the claims.

Having thus described our invention, what we claim as new and desire to secure ters Patent is:

l. A spray-head of the class described, comprising an inner nozzle member, a part fixed to said nozzle member at the rear of its discharge end and forming an internal conical seat, an outer nozzle cooperating with the inner nozzle to form an air discharge passage around its forward end portion andihaving an annular conical projection at its rear end seating against the internal seat of said part, and means without said part having relatively movable members for drawing and holding the outer nozzle to its seat thereagainst.

2. In a spray-head, inner and outer nozzles forming concentric discharge orifices, one for a material to be sprayed and the other for a motive fluid, the outer nozzle having a rear- .wardly projecting annular portion concentric to the nozzle axis and the inner nozzle having a a fixed part for receiving and forming an ind ll ternal conical seat for the projecting portion of the outer nozzle, and means having relatively movable parts for drawing and holding the outer nozzle to its seat against said part, with one part serving as an air control member.

3. In a s ray-head, an inner nozzle having a surroun ing enlargement with a forward overhanging edge portion forming an annular internal conical seat, an outer nozzle havin a rearwardly projecting annular portion or seating within and against said overhanging enlargement, and means comprising a union nut and a relatively rotatable thrust member for drawing and holding said outer nozzle and enlargement together in seating relation.

4. In a spray-head an inner nozzle having a discharge orificein'communication with a material to be sprayed, an outer nozzle cooperating with the inner nozzle to form an annular air discharge orifice in concentric relation to said first orifice and having communication with a source of air pressure supply around the inner nozzle, said outer nozzle having a part seating rearwardly against a part of the inner nozzle and having supplemental air discharge jets'opening into a space Without said seating portions, means holding the outer nozzle to its said seat, and means associated with said nozzle holding means and adjustable to place said space into and out of communication with a source of air pressure supply.

5. In a spray-head, an inner material discharging nozzle, an annular pnrti'on sur rounding said nozzle at the rear of its discharge end and having a forwardly facing inner seat and a rearwardly facing outer seat, an outer air discharging nozzle encircling the discharge end of the inner nozzle and seating against the forwardly facing seat of said portion to center one nozzle with respect to the other, a member engaging said rearwardly facing seat, and means co-operat ing with said member and acting on said outer nozzle to retain the latter on its seat.

6. In a spray-head, an inner material discharging nozzle, a portion surrounding said nozzle and having a forwardly facing inner conical seat and a rearwardly facing outer conical seat, each concentric to the nozzle axis, an outer air discharging nozzle encircling the discharge end of said inner nozzle and seating rearwardly against said inner conical seat to center one nozzle with respect to the other, a member engaging said outer discharge end of the inner nozzle and seating against the forwardly facing seat of said portion said nozzle having supplemental air discharge passages, a member seating against the rearwardly facing seat of said portion and adjustable circumferentially, said member being provided with means for controlling the communication between said supplementel-passages and the source of air pressure supply according to the circumferential adjustment of said member, and means cooperating with said member to retain the outer nozzle on its seat.

8. In a spray-head, an inner material discharge nozzle, an annular portion concentric and disposed at the rear of the discharge end of said nozzle and having a forwardly facing and a rearwardly facing seat, an outer air discharging nozzle encircling the discharge end of the inner nozzle and seating against the forwardly facing seat of said portion, said nozzle aving supplemental air discharge passages, a member seating against the rearwardly facing seat of said portion and provided with means to adjustably control the communication of said supplemental passages with a source of air pressure supply, and means associated With said member and acting on the outer nozzle to retain the latter on its seat.

9. In a spray-head, an inner material discharge nozzle, an annular portion concentric and disposed at therear of the discharge end of said nozzle and having a forwardly facing and a rearwardly facing seat, an outer air discharging nozzle encircling the discharge end of the inner nozzle and seating against the forwardl facing seat of said portion, said nozzle avingsupplemental air discharge passages, a member seating against the rearwardly facing seat of said portion, said portion having passages opening through said relatively facing seat for placing said supplemental passages in communication with a source of air pressure supply, said member being rotatable with respect to said rearwardly facing seat and serving as a valve for opening and closing the passages in said ortion, and means associated with said mem r for retaining the outer nozzle on its seat.

10. In a spray-head an inner nozzle, an annular portion at the rear of the discharge end of said nozzle having forwardly and rearwardly facing annular conical seats concentric to the nozzle axis, an outer nozzle encir cling the discharge end of the inner nozzle and seating against said forwardly facing seat and centered thereby relative to the inner nozzle,said outer nozzle having supplemental air passages and said portion having. air passages through the rearwardly facing seat thereof adapted to open communication between said supplemental passages and a source of air pressure supply, a valve member rotatably seating on said rearwardly facing seat and cooperating therewith to'eifect a graduated closing and opening of said communicating passages, and means holding both said valve member and outer nozzle to their seats.

11. In a spray-head, a fixed member, an inner nozzle fixedly mounted with respect to said member, an annular part fixed with respect to said'member and having an annular seat, an outer nozzle encircling the discharge end of said inner nozzle and having supplemental motive fiuid discharge passages, said :annular' part having a passage through its seat for opening communication between said supplemental passages and a source of motive fluid supply, a member rotatably mounted on said annular seat and operable when rotated relative to the seat to control the opening and closin of the passage through said part, said rotat-a le member having portions adapted to register with portions of said fixed member to indicate the extent of opening of the passage in said part.

12. In a spray-head an inner nozzle, a relatively fixed annular portion surrounding the inner nozzle at the rear of its discharge end and having radial openings therein, an outer air discharge nozzle seating rearwardly against said annular part and having supplemental air passagesadapted to have communication with a source of air pressure supply through .said openings, a valve rotatably mounted on said annular part and having an annular flange adapted to cover or uncover said radial openings, and means operating to retain both said outer nozzle and said valve in assembled relation to said annular part.

13. In a spray-head an inner material discharge nozzle, a relatively fixed annular part surrounding said nozzle at the rear of its discharge end and having opposed forwardly and rearwardly facing annular seats and also having openings through the rearwardly facmg seat, an outer air discharge nozzle surrounding the discharge end of the inner nozzle and seating against the forwardly facing seat of said annular part, said outer nozzle having supplemental air discharge passages adapted to have communication through said 0 enings with a source of air ressure supp y, a manually controlled valve rotatably mounted on said rearwardly facing seat to control said openings, and means operable to connect said outer nozzle and valve and to hold each to its seat on the annular part.

In testimony whereof we have hereunto signed our names to this specification.

GODFREY A. MUELLER. ROBERT TRACY. 

